I'd recomend a UMAX 1200u its usb runs around 120 us and has some of the best TWAIN drivers and scanning software I've ever seen, if you are willing to spend more check out the UMAX Magic Scan II, dumb name but its slide scanning capabilities are out of this world and it allows you to que up multiple scans at once so you can drop 20 slides on the bed and then go get some coffee instead of being chained to the desk waiting for each to scan and then select another part of the preview image to get the next slide or portion of the picture you're scanning